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Data Sheet

LT7170/LT7170-1

THEORY OF OPERATION

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Rev. 0 | 20 of 36

If a fault occurs due to overtemperature, the LT7170/LT7170-1

respond as follows:

►

The output shuts down immediately.

►

The PGOOD pin pulls low.

►

The ALERT pin pulls low.

►

The overtemperature (OT) bit is set in the appropriate status

commands.

►

When the ADC measures that the temperature is less than

the overtemperature threshold, the LT7170/LT7170-1 attempt to

restart.

PGOOD PIN

The open-drain PGOOD pin is pulled low when the output is off for

any reason, during soft start and soft stop, or if the output voltage

is less than the VOUT_UV_FAULT_LIMIT. Other pin conditions are

defined in Table 6.

ALERT PIN

The SMBALERT_MASK command configures which warning and

fault indicators cause the LT7170/LT7170-1 to pull down the open-

drain ALERT pin.

Once the LT7170 or LT7170-1 pulls down the ALERT pin, the de-

vice continues to hold the ALERT pin low until one of the following

occurs:

►

The output is shut off and turned on.

►

A CLEAR_FAULTS, RESTORE_USER_ALL, or MFR_RESET

command is received.

►

All unmasked status bits are cleared by writing a 1 to each bit.

►

The device successfully transmits its address in response to the

PMBus alert response address.

►

Input power is removed from VIN and EXTVCC.

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